English to Japanese Law/Patents Electronics / Elect Eng

For example, the heat exchange members 11, 12 may be welded directly to the bottom surface 20, 22 of the first and second substrates 30, 32, or may be mounted into complimentary retaining structures formed on the bottom surfaces 40, 42 of the first and second substrates 30, 32, for example, by press fitting, shrink fitting and/or soldering.

この場合の"press fitting"はどういう意味でしょうか？